zebra/connected.c

   1 /*
   2  * Address linked list routine.
   3  * Copyright (C) 1997, 98 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "prefix.h"
  25 #include "linklist.h"
  26 #include "if.h"
  27 #include "table.h"
  28 #include "rib.h"
  29 #include "table.h"
  30 #include "log.h"
  31 #include "memory.h"
  32 #include "zebra_memory.h"
  33
  34 #include "vty.h"
  35 #include "zebra/debug.h"
  36 #include "zebra/zserv.h"
  37 #include "zebra/redistribute.h"
  38 #include "zebra/interface.h"
  39 #include "zebra/connected.h"
  40 #include "zebra/rtadv.h"
  41 #include "zebra/zebra_mpls.h"
  42 #include "zebra/debug.h"
  43 #include "zebra/zebra_errors.h"
  44
  45 /* communicate the withdrawal of a connected address */
  46 static void connected_withdraw(struct connected *ifc)
  47 {
  48         if (!ifc)
  49                 return;
  50
  51         /* Update interface address information to protocol daemon. */
  52         if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL)) {
  53                 zebra_interface_address_delete_update(ifc->ifp, ifc);
  54
  55                 if (ifc->address->family == AF_INET)
  56                         if_subnet_delete(ifc->ifp, ifc);
  57
  58                 connected_down(ifc->ifp, ifc);
  59
  60                 UNSET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
  61         }
  62
  63         /* The address is not in the kernel anymore, so clear the flag */
  64         UNSET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
  65
  66         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED)) {
  67                 listnode_delete(ifc->ifp->connected, ifc);
  68                 connected_free(&ifc);
  69         }
  70 }
  71
  72 static void connected_announce(struct interface *ifp, struct connected *ifc)
  73 {
  74         if (!ifc)
  75                 return;
  76
  77         if (!if_is_loopback(ifp) && ifc->address->family == AF_INET &&
  78             !IS_ZEBRA_IF_VRF(ifp)) {
  79                 if (ifc->address->prefixlen == 32)
  80                         SET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
  81                 else
  82                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_UNNUMBERED);
  83         }
  84
  85         listnode_add(ifp->connected, ifc);
  86
  87         /* Update interface address information to protocol daemon. */
  88         if (ifc->address->family == AF_INET)
  89                 if_subnet_add(ifp, ifc);
  90
  91         zebra_interface_address_add_update(ifp, ifc);
  92
  93         if (if_is_operative(ifp)) {
  94                 connected_up(ifp, ifc);
  95         }
  96 }
  97
  98 /* If same interface address is already exist... */
  99 struct connected *connected_check(struct interface *ifp,
 100                                   union prefixconstptr pu)
 101 {
 102         const struct prefix *p = pu.p;
 103         struct connected *ifc;
 104         struct listnode *node;
 105
 106         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc))
 107                 if (prefix_same(ifc->address, p))
 108                         return ifc;
 109
 110         return NULL;
 111 }
 112
 113 /* same, but with peer address */
 114 struct connected *connected_check_ptp(struct interface *ifp,
 115                                       union prefixconstptr pu,
 116                                       union prefixconstptr du)
 117 {
 118         const struct prefix *p = pu.p;
 119         const struct prefix *d = du.p;
 120         struct connected *ifc;
 121         struct listnode *node;
 122
 123         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
 124                 if (!prefix_same(ifc->address, p))
 125                         continue;
 126                 if (!CONNECTED_PEER(ifc) && !d)
 127                         return ifc;
 128                 if (CONNECTED_PEER(ifc) && d
 129                     && prefix_same(ifc->destination, d))
 130                         return ifc;
 131         }
 132
 133         return NULL;
 134 }
 135
 136 /* Check if two ifc's describe the same address in the same state */
 137 static int connected_same(struct connected *ifc1, struct connected *ifc2)
 138 {
 139         if (ifc1->ifp != ifc2->ifp)
 140                 return 0;
 141
 142         if (ifc1->flags != ifc2->flags)
 143                 return 0;
 144
 145         if (ifc1->conf != ifc2->conf)
 146                 return 0;
 147
 148         if (ifc1->destination)
 149                 if (!ifc2->destination)
 150                         return 0;
 151         if (ifc2->destination)
 152                 if (!ifc1->destination)
 153                         return 0;
 154
 155         if (ifc1->destination && ifc2->destination)
 156                 if (!prefix_same(ifc1->destination, ifc2->destination))
 157                         return 0;
 158
 159         return 1;
 160 }
 161
 162 /* Handle changes to addresses and send the neccesary announcements
 163  * to clients. */
 164 static void connected_update(struct interface *ifp, struct connected *ifc)
 165 {
 166         struct connected *current;
 167
 168         /* Check same connected route. */
 169         current = connected_check_ptp(ifp, ifc->address, ifc->destination);
 170         if (current) {
 171                 if (CHECK_FLAG(current->conf, ZEBRA_IFC_CONFIGURED))
 172                         SET_FLAG(ifc->conf, ZEBRA_IFC_CONFIGURED);
 173
 174                 /* Avoid spurious withdraws, this might be just the kernel
 175                  * 'reflecting'
 176                  * back an address we have already added.
 177                  */
 178                 if (connected_same(current, ifc)) {
 179                         /* nothing to do */
 180                         connected_free(&ifc);
 181                         return;
 182                 }
 183
 184                 /* Clear the configured flag on the old ifc, so it will be freed
 185                  * by
 186                  * connected withdraw. */
 187                 UNSET_FLAG(current->conf, ZEBRA_IFC_CONFIGURED);
 188                 connected_withdraw(
 189                         current); /* implicit withdraw - freebsd does this */
 190         }
 191
 192         /* If the connected is new or has changed, announce it, if it is usable
 193          */
 194         if (CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 195                 connected_announce(ifp, ifc);
 196 }
 197
 198 /* Called from if_up(). */
 199 void connected_up(struct interface *ifp, struct connected *ifc)
 200 {
 201         afi_t afi;
 202         struct prefix p = {0};
 203         struct nexthop nh = {
 204                 .type = NEXTHOP_TYPE_IFINDEX,
 205                 .ifindex = ifp->ifindex,
 206                 .vrf_id = ifp->vrf_id,
 207         };
 208         struct zebra_vrf *zvrf;
 209         uint32_t metric;
 210
 211         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 212         if (!zvrf) {
 213                 flog_err(
 214                         EC_ZEBRA_VRF_NOT_FOUND,
 215                         "%s: Received Up for interface but no associated zvrf: %d",
 216                         __func__, ifp->vrf_id);
 217                 return;
 218         }
 219         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 220                 return;
 221
 222         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 223
 224         /* Apply mask to the network. */
 225         apply_mask(&p);
 226
 227         afi = family2afi(p.family);
 228
 229         switch (afi) {
 230         case AFI_IP:
 231                 /*
 232                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 233                  * address.
 234                  */
 235                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 236                         return;
 237                 break;
 238         case AFI_IP6:
 239 #ifndef GNU_LINUX
 240                 /* XXX: It is already done by rib_bogus_ipv6 within rib_add */
 241                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 242                         return;
 243 #endif
 244                 break;
 245         default:
 246                 flog_warn(EC_ZEBRA_CONNECTED_AFI_UNKNOWN,
 247                           "Received unknown AFI: %s", afi2str(afi));
 248                 return;
 249                 break;
 250         }
 251
 252         metric = (ifc->metric < (uint32_t)METRIC_MAX) ?
 253                                 ifc->metric : ifp->metric;
 254         rib_add(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 255                 0, 0, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 256
 257         rib_add(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 258                 0, 0, &p, NULL, &nh, 0, zvrf->table_id, metric, 0, 0, 0);
 259
 260         /* Schedule LSP forwarding entries for processing, if appropriate. */
 261         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 262                 if (IS_ZEBRA_DEBUG_MPLS) {
 263                         char buf[PREFIX_STRLEN];
 264
 265                         zlog_debug(
 266                                 "%u: IF %s IP %s address add/up, scheduling MPLS processing",
 267                                 zvrf->vrf->vrf_id, ifp->name,
 268                                 prefix2str(&p, buf, sizeof(buf)));
 269                 }
 270                 mpls_mark_lsps_for_processing(zvrf, &p);
 271         }
 272 }
 273
 274 /* Add connected IPv4 route to the interface. */
 275 void connected_add_ipv4(struct interface *ifp, int flags, struct in_addr *addr,
 276                         uint16_t prefixlen, struct in_addr *dest,
 277                         const char *label, uint32_t metric)
 278 {
 279         struct prefix_ipv4 *p;
 280         struct connected *ifc;
 281
 282         if (ipv4_martian(addr))
 283                 return;
 284
 285         /* Make connected structure. */
 286         ifc = connected_new();
 287         ifc->ifp = ifp;
 288         ifc->flags = flags;
 289         ifc->metric = metric;
 290         /* If we get a notification from the kernel,
 291          * we can safely assume the address is known to the kernel */
 292         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 293
 294         /* Allocate new connected address. */
 295         p = prefix_ipv4_new();
 296         p->family = AF_INET;
 297         p->prefix = *addr;
 298         p->prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 299                                                          : prefixlen;
 300         ifc->address = (struct prefix *)p;
 301
 302         /* If there is a peer address. */
 303         if (CONNECTED_PEER(ifc)) {
 304                 /* validate the destination address */
 305                 if (dest) {
 306                         p = prefix_ipv4_new();
 307                         p->family = AF_INET;
 308                         p->prefix = *dest;
 309                         p->prefixlen = prefixlen;
 310                         ifc->destination = (struct prefix *)p;
 311
 312                         if (IPV4_ADDR_SAME(addr, dest))
 313                                 flog_warn(
 314                                         EC_ZEBRA_IFACE_SAME_LOCAL_AS_PEER,
 315                                         "warning: interface %s has same local and peer address %s, routing protocols may malfunction",
 316                                         ifp->name, inet_ntoa(*addr));
 317                 } else {
 318                         zlog_debug(
 319                                 "warning: %s called for interface %s with peer flag set, but no peer address supplied",
 320                                 __func__, ifp->name);
 321                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 322                 }
 323         }
 324
 325         /* no destination address was supplied */
 326         if (!dest && (prefixlen == IPV4_MAX_PREFIXLEN)
 327                 && if_is_pointopoint(ifp))
 328                 zlog_debug(
 329                         "warning: PtP interface %s with addr %s/%d needs a peer address",
 330                         ifp->name, inet_ntoa(*addr), prefixlen);
 331
 332         /* Label of this address. */
 333         if (label)
 334                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 335
 336         /* For all that I know an IPv4 address is always ready when we receive
 337          * the notification. So it should be safe to set the REAL flag here. */
 338         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 339
 340         connected_update(ifp, ifc);
 341 }
 342
 343 void connected_down(struct interface *ifp, struct connected *ifc)
 344 {
 345         afi_t afi;
 346         struct prefix p;
 347         struct nexthop nh = {
 348                 .type = NEXTHOP_TYPE_IFINDEX,
 349                 .ifindex = ifp->ifindex,
 350                 .vrf_id = ifp->vrf_id,
 351         };
 352         struct zebra_vrf *zvrf;
 353
 354         zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
 355         if (!zvrf) {
 356                 flog_err(
 357                         EC_ZEBRA_VRF_NOT_FOUND,
 358                         "%s: Received Up for interface but no associated zvrf: %d",
 359                         __func__, ifp->vrf_id);
 360                 return;
 361         }
 362
 363         if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 364                 return;
 365
 366         PREFIX_COPY(&p, CONNECTED_PREFIX(ifc));
 367
 368         /* Apply mask to the network. */
 369         apply_mask(&p);
 370
 371         afi = family2afi(p.family);
 372
 373         switch (afi) {
 374         case AFI_IP:
 375                 /*
 376                  * In case of connected address is 0.0.0.0/0 we treat it tunnel
 377                  *  address.
 378                  */
 379                 if (prefix_ipv4_any((struct prefix_ipv4 *)&p))
 380                         return;
 381                 break;
 382         case AFI_IP6:
 383                 if (IN6_IS_ADDR_UNSPECIFIED(&p.u.prefix6))
 384                         return;
 385                 break;
 386         default:
 387                 zlog_warn("Unknown AFI: %s", afi2str(afi));
 388                 break;
 389         }
 390
 391         /*
 392          * Same logic as for connected_up(): push the changes into the
 393          * head.
 394          */
 395         rib_delete(afi, SAFI_UNICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT, 0,
 396                    0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false, true);
 397
 398         rib_delete(afi, SAFI_MULTICAST, zvrf->vrf->vrf_id, ZEBRA_ROUTE_CONNECT,
 399                    0, 0, &p, NULL, &nh, 0, zvrf->table_id, 0, 0, false, true);
 400
 401         /* Schedule LSP forwarding entries for processing, if appropriate. */
 402         if (zvrf->vrf->vrf_id == VRF_DEFAULT) {
 403                 if (IS_ZEBRA_DEBUG_MPLS) {
 404                         char buf[PREFIX_STRLEN];
 405
 406                         zlog_debug(
 407                                 "%u: IF %s IP %s address down, scheduling MPLS processing",
 408                                 zvrf->vrf->vrf_id, ifp->name,
 409                                 prefix2str(&p, buf, sizeof(buf)));
 410                 }
 411                 mpls_mark_lsps_for_processing(zvrf, &p);
 412         }
 413 }
 414
 415 static void connected_delete_helper(struct connected *ifc, struct prefix *p)
 416 {
 417         struct interface *ifp;
 418
 419         if (!ifc)
 420                 return;
 421         ifp = ifc->ifp;
 422
 423         connected_withdraw(ifc);
 424
 425         /* Schedule LSP forwarding entries for processing, if appropriate. */
 426         if (ifp->vrf_id == VRF_DEFAULT) {
 427                 if (IS_ZEBRA_DEBUG_MPLS) {
 428                         char buf[PREFIX_STRLEN];
 429
 430                         zlog_debug(
 431                                 "%u: IF %s IP %s address delete, scheduling MPLS processing",
 432                                 ifp->vrf_id, ifp->name,
 433                                 prefix2str(p, buf, sizeof(buf)));
 434                 }
 435                 mpls_mark_lsps_for_processing(vrf_info_lookup(ifp->vrf_id), p);
 436         }
 437 }
 438
 439 /* Delete connected IPv4 route to the interface. */
 440 void connected_delete_ipv4(struct interface *ifp, int flags,
 441                            struct in_addr *addr, uint16_t prefixlen,
 442                            struct in_addr *dest)
 443 {
 444         struct prefix p, d;
 445         struct connected *ifc;
 446
 447         memset(&p, 0, sizeof(struct prefix));
 448         p.family = AF_INET;
 449         p.u.prefix4 = *addr;
 450         p.prefixlen = CHECK_FLAG(flags, ZEBRA_IFA_PEER) ? IPV4_MAX_PREFIXLEN
 451                                                         : prefixlen;
 452
 453         if (dest) {
 454                 memset(&d, 0, sizeof(struct prefix));
 455                 d.family = AF_INET;
 456                 d.u.prefix4 = *dest;
 457                 d.prefixlen = prefixlen;
 458                 ifc = connected_check_ptp(ifp, &p, &d);
 459         } else
 460                 ifc = connected_check_ptp(ifp, &p, NULL);
 461
 462         connected_delete_helper(ifc, &p);
 463 }
 464
 465 /* Add connected IPv6 route to the interface. */
 466 void connected_add_ipv6(struct interface *ifp, int flags, struct in6_addr *addr,
 467                         struct in6_addr *dest, uint16_t prefixlen,
 468                         const char *label, uint32_t metric)
 469 {
 470         struct prefix_ipv6 *p;
 471         struct connected *ifc;
 472
 473         if (ipv6_martian(addr))
 474                 return;
 475
 476         /* Make connected structure. */
 477         ifc = connected_new();
 478         ifc->ifp = ifp;
 479         ifc->flags = flags;
 480         ifc->metric = metric;
 481         /* If we get a notification from the kernel,
 482          * we can safely assume the address is known to the kernel */
 483         SET_FLAG(ifc->conf, ZEBRA_IFC_QUEUED);
 484
 485         /* Allocate new connected address. */
 486         p = prefix_ipv6_new();
 487         p->family = AF_INET6;
 488         IPV6_ADDR_COPY(&p->prefix, addr);
 489         p->prefixlen = prefixlen;
 490         ifc->address = (struct prefix *)p;
 491
 492         /* Add global ipv6 address to the RA prefix list */
 493         if (!IN6_IS_ADDR_LINKLOCAL(&p->prefix))
 494                 rtadv_add_prefix(ifp->info, p);
 495
 496         if (dest) {
 497                 p = prefix_ipv6_new();
 498                 p->family = AF_INET6;
 499                 IPV6_ADDR_COPY(&p->prefix, dest);
 500                 p->prefixlen = prefixlen;
 501                 ifc->destination = (struct prefix *)p;
 502         } else {
 503                 if (CHECK_FLAG(ifc->flags, ZEBRA_IFA_PEER)) {
 504                         zlog_debug(
 505                                 "warning: %s called for interface %s with peer flag set, but no peer address supplied",
 506                                 __func__, ifp->name);
 507                         UNSET_FLAG(ifc->flags, ZEBRA_IFA_PEER);
 508                 }
 509         }
 510
 511         /* Label of this address. */
 512         if (label)
 513                 ifc->label = XSTRDUP(MTYPE_CONNECTED_LABEL, label);
 514
 515         /* On Linux, we only get here when DAD is complete, therefore we can set
 516          * ZEBRA_IFC_REAL.
 517          *
 518          * On BSD, there currently doesn't seem to be a way to check for
 519          * completion of
 520          * DAD, so we replicate the old behaviour and set ZEBRA_IFC_REAL,
 521          * although DAD
 522          * might still be running.
 523          */
 524         SET_FLAG(ifc->conf, ZEBRA_IFC_REAL);
 525         connected_update(ifp, ifc);
 526 }
 527
 528 void connected_delete_ipv6(struct interface *ifp, struct in6_addr *address,
 529                            struct in6_addr *dest, uint16_t prefixlen)
 530 {
 531         struct prefix p, d;
 532         struct connected *ifc;
 533
 534         memset(&p, 0, sizeof(struct prefix));
 535         p.family = AF_INET6;
 536         memcpy(&p.u.prefix6, address, sizeof(struct in6_addr));
 537         p.prefixlen = prefixlen;
 538
 539         /* Delete global ipv6 address from RA prefix list */
 540         if (!IN6_IS_ADDR_LINKLOCAL(&p.u.prefix6))
 541                 rtadv_delete_prefix(ifp->info, &p);
 542
 543         if (dest) {
 544                 memset(&d, 0, sizeof(struct prefix));
 545                 d.family = AF_INET6;
 546                 IPV6_ADDR_COPY(&d.u.prefix6, dest);
 547                 d.prefixlen = prefixlen;
 548                 ifc = connected_check_ptp(ifp, &p, &d);
 549         } else
 550                 ifc = connected_check_ptp(ifp, &p, NULL);
 551
 552         connected_delete_helper(ifc, &p);
 553 }
 554
 555 int connected_is_unnumbered(struct interface *ifp)
 556 {
 557         struct connected *connected;
 558         struct listnode *node;
 559
 560         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, connected)) {
 561                 if (CHECK_FLAG(connected->conf, ZEBRA_IFC_REAL)
 562                     && connected->address->family == AF_INET)
 563                         return CHECK_FLAG(connected->flags,
 564                                           ZEBRA_IFA_UNNUMBERED);
 565         }
 566         return 0;
 567 }